#1**0 **

OK, Young person, here is the question:

In the top 40 rankings of men tennis players, what is the probability that at least 3 of them share the same birthday(the same day of the year?) Your answer must be accurate to 3 decimal places. You must give the method used in your calculation. Good luck to all.

Guest Nov 11, 2015

#5**0 **

According to Wolfram|Alpha, the probability that at least 3 people have the same birthday is 0.06689

In the top 40 rankings of men tennis players, what is the probability that at least 3 of them share the same birthday(the same day of the year?) Your answer must be accurate to 3 decimal places. You must give the method used in your calculation. Good luck to all.

This is what Wolfram|alpha has to say

I also found some formuals here

http://math.stackexchange.com/questions/25876/probability-of-3-people-in-a-room-of-30-having-the-same-birthday

I have not looked very hard at the formulas but i doubt that their derivation is trivial.

They may well be valid but to use them without understanding is no better than to just cut and past a page from Wolfram|Alpha. (Unless you want to use it for computer output or something. Of course Wolfram Alpha has generated its answers from formulas in the first place)

Melody
Nov 12, 2015